Dynamo-electric machine.



B. A. BEHREND.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JAN. 81, 1906.

Patented Nov. 17, 1908.

fNvENTuR:

\A/iawsssss reason that the lugs,

BERNARD ARTHUR BEHREND, OF NORWOOD, OHIO, ASSIGNOR TO ALLIS-CHALMERSCOMPANY, A CORPORATION OF NEW JERSEY, AND THE BULLOCK ELECTRIC MANU-FACTURING COMPANY, A CORPORATION OF OHIO.

DYNAMO-E LECTRIC MAQHIN E Specification of Letters Patent.

Patented Nov. 17, 1908.

Application filed January 31, 1906. Serial No. 298,753.

To all whom it may concern:

7 Be it known that I, BERNARD ARTHUR l'iEHRENI), citizen of the UnitedStates, residing at Xorwood, in the county of Hamilton and State ofOhio, have invented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a full, clear, and exactspecification.

My invention relates to armature cores of dynamo-clectric machines andespecially to the separators which are employed to divide the lamimrinto groups and to space them apart for the purpose of providingventilating air passageways.

It is customary to build up armature cores of groups of lamina, whichare spaced apart by separators usually segmental in shape and made ofcast or sheet metal. The separators should have sufficient mechanicalstrength to hold the laminzc a proper distance apart and should be soconstructed that they will not interfere to a material extent with thefree outward flow of air. A common form of separator or ventilatingsegment which possesses the above necessary qualities is made of castmetal, preferably brass, and

consists of a number of separating or spacing ribs joined together by aweb. Means should be provided for securely fastening each segn'ient inplace and for preventing outward displacement due to centrifugal forceat high speeds. It has been proposed to retain the above type ofsegments in place by means of integrally cast lugs which engage theinterior surface of the core at one or both sides of the segment. Thisconstruction, while suitable for retaining the segments in place, isobjectionable for the which in the ordinary form of the segment areextensions'of the narrow ribs, are easily broken off in handling orshipping, rendering the segments useless.

The object of my invention is to provide retaining means for thesegments which will hold the latter securely in place without dan ger ofoutward displacement even at highest speeds and which will not be easilybroken or destroyed. \Vith this end in view, I retain the segments inplace by means which engage the segments and the interior surface of thecore.

More specifically considered my invention consists in an armature coreconsisting of groups of laminae which are spaced apart by separatingsegments, each of which segments has a plurality of ribs, a certain number of which have enlarged, perforated portions extending beyond theinterior surface of thecore, and transverse pins engaging the perforatedportions of the ribs and the interior surface of the core at each sideof the segment.

My invention still further consists in the details of construction, andcombinations and arrangements of parts, described in the specificationand set forth in the appended claims.

For a better uiulerstanding of my invention. reference is had to theaccompanying drawings, in which Figure l is a section of an armaturecore embodying my invention; Fig. 2 is an elevation of one of theseparating segments; Fig. 3 is an end view of the same; Fig. 4; is apartial elevation of a slightly modified form of segment; Fig. 5 is asection of the same; and Fig. (3 is a partial plan view of a segmentshowing the preferred form of holding pin.

Referringnow to the figures of the drawings, I have shown at a shaft ofthe ma chine carrying the spider 11, to which the armature core issecured. The armature core consists of groups of laminae 12, which areheld between end heads 13 and 13 the former being integral with thespider and the latter being held in place by a split retaining ring 15.The groups of laminae are held a predetermined distance apart byseparators 14, the number of groups and the distance at which they areheld apart depending upon the size and purpose of the machine and theconditions under which it is to be operated. In this case, theseparators consist of cast segments, one of which is shown in Fig. 2,which segments are arranged end to end around the core in the usualmanner. The segments are preferably cast from non-magnetic metal, brassbeing very suitable for this purpose. As is shown in the drawing, eachsegment consists of a number of spaced ribs 15 joined together by anintegral web 16. This construction is light, but sufficiently strong towithstand stresses due to centrifugal force, and will not interfereseriously with the outward circulation of air.

Since the armature is rotated at considerable speed, means must beprovided for preventing outward displacement of the segments due tocentrifugal force. For this purpose, I provide the segments withintegral lugs or enlarged portions 17 provided with perforations 18.These lugs or enlarged portions will, when the parts are assembled,extend partially beyond the interior surface of the core, and I insertin the perforation of each lug, a pin, bolt or rod 19 which will not beeasily broken by a sharp blow, and in case it should be broken, it caneasily be replaced at a slight cost. I have found that cotter-pins arevery suitable for this purpose. Such a pin is shown in Fig. 6. As isshown in the drawing, the retain ing pins extend beyond both sides ofthe lugs and engage closely the interior surface of the core. I preferto form the lugs by prolonging and enlarging the inner ends of certainof the ribs, three of the ribs in this case being provided with theperforated lugs or enlarged portions. However, the lugs may extend fromany part of the inner edge of the segment.

As shown inFig. 3, the Web 16 joining the ribs is flush with one side ofthe ribs. In Figs. 4 and 5 the web-16* joining the ribs is in the centerof thelatter. Either construction may be employed, but I prefer theformer construction, for the reason that it can be cast moreconveniently. In the construction shown in Figs. 4 and 5, the perforatedlugs are braced by extensions. 20 of the web. In either constructionthere is less danger of the lugs being broken off than in theconstruction in which cast-metal retaining lugs extend outward on bothsides of the ribs.

I aim in my claims to cover all modifications which do not involve adeparture from the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent is 1. In adynamo-electric machine, an armature core built up of sections,separators between said sections, and separate means engaging theseparators and the inner faces of tllie sections for retaining theseparators in p ace.

2. In a dynamo-electric machine, a core built up of groups of laminae,separators between the said groups, each separator having an extensionbeyond the inner surface of the core, and a non-integral retaining pinof rod engaging each extension and the inner surface of the. core.

3. An armature core comprising a plura lity of groups of laminae,separating segments between the groups, each segment having one or moreperforated portions extending beyond the interior surface'of the core,and retaining means engaging the interior surface of the core and theperforated portions of the segments.

4. An armature core comprising groups of laminae, separating segmentsbetween the groups, said segments having perforated lugs extendingbeyond the interior surface of the core, and retaining means passingthrough said perforated lugs and engaging the interior surface of thecore.

5. An armature core comprising groups of laminae, separating segmentsbetween said groups, each of said segments having a plurality of ribs,and means engaging the inner portions of certain of said ribs and theinterior surface of the core for retaining the segments in place.

(5. An armature core comprising groups of laminae, separating segmentsbetween said groups, each of said segments having a plurality of ribs,certain of said ribs having pcrfoiated portions, and transverse pins orrods in the perforated portions and engaging the interior surface of thecore.

7. An armature core comprising groups of laminae, separating segmentsbetween said groups, each of said segments having a plurality of ribs,certain of said ribs having enlarged perforated portions extendingbeyond the interior surface of the core, and transverse pins engagingsaid perforated portions of the ribs and the interior surface of thecore.

8. An armature core comprising groups of laminae, separating segmentsbetween said groups, each segment consisting of a plurality of ribsjoined by a narrow web or band, the inner portions of certain of saidribs having enlarged perforated portions of the same width as the ribsand extending beyond the interior surface of the core, and

transverse pins or rods in said perforatedportions and extending beyondeach side thereof and engaging the interior surface of the core.

In testimony whereof I afiix my signature,

in the presence of two witnesses.

' BERNARD ARTHUR BEHREND.

Witnesses:

HARRIET SUI'PHIN, LAURA E. WELOH.

